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Starter Solenoid Does Not Click




Starter Solenoid Does Not Click

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information






Circuit/System Description

When the ignition mode switch is placed in the START position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the START position. The BCM then sends a serial data message to the engine control module (ECM) that crank has been requested. The ECM then verifies that the clutch is fully depressed or the automatic transmission is in Park/Neutral. If it is, the ECM then supplies 12 V to the control circuit of the starter relay. When this occurs, battery voltage is supplied through the switch of the starter relay to the starter solenoid.

Reference Information

Schematic Reference

* Starting and Charging Schematics Electrical Diagrams

* Automatic Transmission Controls Schematics 6T70/6T75 - Automatic Transmission for the MH2 and MH4 transmission

* Automatic Transmission Controls Schematics 6T30/6T40/6T45/6T50 - Automatic Transmission for the MH7 transmission

Connector End View Reference

Component Connector End Views Sunshade - Left Front

Description and Operation

Starting System Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Verification

1. Ignition ON, verify that no ignition, starter relay, brake pedal position sensor, theft deterrent, or automatic transmission DTCs are set that would cause the ECM to disable engine starting.

• If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

2. Ignition ON, transmission in park, observe the scan tool BCM 5 V Ignition Switch parameter. Place the ignition switch in the crank position, the parameter should display Crank Request.

• If not the specified value, refer to Symptoms - Wiring Systems Symptoms - Wiring Systems.

3. Transmission in park, verify the scan tool Transmission Control Module (TCM) Internal Mode Switch parameter displays Park.

• If the TCM Internal Mode Switch parameter does not indicate Park. Refer to Transmission Internal Mode Switch Logic Transmission Internal Mode Switch Logic for the MH2 or MH4 transmission or Transmission Internal Mode Switch Logic Transmission Internal Mode Switch Logic for the MH7 transmission.

4. Transmission in park or neutral attempt to start the vehicle. The crank relay should click and the engine should begin cranking.

• If the starter relay does not click or the engine does not crank, refer to Circuit/System Testing.

Circuit/System Testing

1. Ignition ON and transmission in Park, with a scan tool verify the ECM Park/Neutral Position Switch parameter displays Active.

• If the parameter does not display Active, test the ECM Park/Neutral signal circuit terminal 58 X2 for a short to ground or an open/high resistance.

2. Ignition ON, verify the scan tool ECM Ignition 1 Signal parameter is greater than 10 V.

• If less than the specified range, test the ECM ignition circuit terminal 51 X1 for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

3. Ignition OFF, disconnect the KR27 starter relay.

4. Ignition OFF and scan tool disconnected, open and close the driver door and wait 1 minute. Test for less than 10 ohms between the relay ground circuit terminal 86 and ground

• If greater than the specified range, test the ground circuit for an open/high resistance.

5. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

6. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.

• If the test lamp illuminates, test the control circuit for a short to voltage.

7. Connect a 30 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the M64 starter motor is activated.

• If the M64 starter motor does not activate, test the control circuit for a short to ground and an open/high resistance. If the circuit tests normal, test or replace the M64 starter motor.

8. Connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86.

9. Command the starter relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

10. If all circuits test normal, test or replace the KR27 starter relay.

Component Testing

Relay Test

1. Ignition OFF, disconnect the KR27 starter relay.

2. Test for 60-180 omhs between terminals 85 and 86.

• If not within the specified range, replace the relay.

3. Test for infinite resistance between the following terminals:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

• If not the specified value, replace the relay.

4. Install a 5 A fused jumper wire between relay terminal 86 and 12 V. Install a jumper wire between relay terminal 85 and ground. Test for less than 2 omhs between terminals 30 and 87.

• If greater than specified range, replace the relay.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement 6T70/6T75 - Automatic Transmission for the MH2/MH4 transmission

* Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement 6T30/6T40/6T45/6T50 - Automatic Transmission for the MH7 transmission

* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)

* Control Module References Programming and Relearning for ECM replacement, setup, and programming

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